Drawing pen



y 9, 1950 L. w. GUNN, JR 2,507,005

DRAWING PEN Filed July 25, 1947 Z4 v 54 2a INVENTOR. L/oga M/ 60/1/7 dn Patented May 9, 1950 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to drawing pens, and more particularly to a drawing pen having an ink reservoir attached thereto and means for controlling the supply of ink from the reservoir to the pen points.

It is among the objects of the invention to provide an improved drawing pen assembly including a nib portion and a barrel portion detachably connected together, and manually-controllable means providing a filler opening for the barrel and regulating the flow of ink from the barrel to the nib and points, which pen is of simple and durable construction, economical to manufacture, easy to assemble and disassemble, and of neat and attractive appearance.

Other objects and advantages will become apparent from a consideration of the following description in conjunction with the accompanying drawing, wherein:

Figure 1 is a longitudinal elevation of a pen illustrative of the invention;

Figure 2 is a longitudinal cross-section on an enlarged scale of the pen illustrated in Figure 1; and

Figure 3 is a transverse cross-section on the line 3-3 of Figure 2.

With continued reference to the drawing, the pen has a nib portion, generally indicated at It), and a barrel portion, generally indicated at II, the barrel being detachably associated with the nib by suitable means, such as the screw connection H.

The nib I is bifurcated to provide a pair of parallel spaced-apart points l3 and I4 having pointed outer ends l5 of conventional shape to apply a line of ink to the surface of drawing paper. At their inner ends the points I3 and M are integrally joined to the corresponding end of a hollow, cylindrical ferrule it having internal screw threads in the outer-end portion thereof and a tapered valve aperture 11 in its end to which the points l3 and M are joined. The aperture l1 opens into the space between the points ['3 and I4 and these points are internally recessed longitudinally to provide channels l8 leading from the aperture H to the outer or pointed ends of the points. The point i4 is reduced in thickness intermediate its length, as indicated at I9, to render it resilient and an adjusting screw 20 is threaded transversely through both of the points to adjust the space between the pointed ends thereof to thereby regulate the thickness of the lines made by the pen.

The barrel I I is a hollow cylindrical or tubular structure having at one end an externally-screw- EEO-42.6)

threaded boss 2| which is threaded into the outer end of the ferrule 56, the internal threads in the ferrule and the external threads on the boss 2| constituting the screw-thread connection l2. The boss 2! is provided with a central aperture 22 and the opposite or other end of the barrel H is provided with internal screw threadswhich may be formed within an annular enlargement 23.

A screw plug 24 is provided for the outer end of the barrel and comprises a knob portion 25 having an internally-screw-threaded opening or recess 25 thereinand a cylindrical sleeve portion 21 extending from the knob surrounding the opening 26 and receivable in the open end of the barrel H. The plug 26 is provided with external screw threads which engage with the internal screw threads provided in the thickened end portion 23 of the barrel so that the plug is threadable into and out of the end portion of the barrel. The sleeve 21 is provided at one side thereof with an elongated opening or notch 28 which provides a filler opening through which ink may be passed into the barrel when the plug 24 is moved outwardly to expose the slot. A rod 30 extends through the barrel II and has one end threaded into the opening 26 in the screw plug 24. This rod extends through the aperture 22 in the barrel boss 2l' and is provided on its end opposite that secured in the plug '24 with a tapered valve plug 3| which cooperates with the tapered valve aperture 11 to close the aperture when the rod 30 is moved to one of its extreme positions, and an annular shoulder 32 which contacts the adjacent end of the boss 2| to close the aperture 22 when the rod is moved to its opposite extreme position.

The apertures 22 and I! and the space 33 in the ferrule between these apertures constitute an ink passage from the barrel H to the nib I0 and the valve plug 3| and annular shoulder 32 constitute an enlargement on the end of rod 30 which enlargement is positioned in space 33 between the apertures ll and 22 and is operative to close the ink passage when the rod 30 is in either of its extreme positions. When the rod is in an intermediate position the passage is open and the flow of ink through the passage may be controlled by adjustably positioning the tapered plug 3| relative to the tapered valve aperture H.

The slot 28 in the sleeve portion of the end plug 20 has a length such that a small portion thereof is exposed at the corresponding end of the barrel H as long as the valve plug 3! is not seated in the valve aperture l7, thus providing a restricted opening through which air may flow to the interior of the barrel as the ink in the barrel flows through the ink passage to the pen nib. When the plug 24 is turned fully in, the slot 28 is closed and the plug 31 seats in the aperture 11 sealing ofi the ink reservoir in the barrel II at both ends thereof. When the plug 24 is turned fully out of the barrel the entire length of the slot 28 is exposed to provide an ink-filler opening for the barrel and the annular shoulder 32 is brought against the end of the boss 21 to close the aperture 22 so that this end of the ink reservoir will be closed while the reservoir is being filled. After the barrel reservoir has been filled with ink the knob may be turned in until the desired rate of flow through the aperture I! is obtained, after which the pen may be used for an extended interval without re-filling. When it is desired to lay the pen aside with ink remaining in the reservoir the plug 24 is turned fully in to seal both ends of the reservoir, as explained above.

In order to assemble the pen the screw plug '24 is threaded into the open end of the barrel H, the rod 3'9 is then inserted through the aperture 22 and threaded into the screw plug and the nib pen is then threaded onto the boss 2| of the barrel. The pen may be disassembled for cleaning or repair by an obvious reversal of this operation.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are. therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claim are, therefore, intended to be embraced therein.

What is claimed is:

A drawing pen comprising a bifurcated nib portion having a pair of separated points and an internally-screw-threaded ferrule integral with said points and provided with a valve aperture opening between said points at the ends thereof joined to said ferrule, an adjusting screw 4 threaded through said points, a cylindrical barrel having at one end an externally-screw-threaded apertured boss receivable in said ferrule and internal screw threads in the opposite end portion thereof, an externally-screw-threaded screw plug received in said internally-sorew-threaded end portion of said barrel and comprising a knob portion having a central, screw-threaded opening therein and a cylindrical sleeve extending from said knob into said barrel and having a slot in one side thereof, a rod extending through said barrel having one end threaded into said screw plug and the opposite end provided with a tapered valve plug cooperating with said valve aperture to close said aperture when said rod and screw plug are in one extreme position relative to said barrel and an annular shoulder engageable with the end of said boss when said rod and said screw plug are in the opposite extreme position to close the aperture through said boss, said slot in said screw plug sleeve being exposed at the end of 'said barrel for filling said barrel when said rod shoulder is in engagement with the end of said boss, included entirely within said barrel when said valve plug is in closing association with said valve aperture, and slightly exposed to permit air iiow into said barrel when said rod is in an intermediate position providing an ink-flow passage from said barrel to said nib.

LLOYD W. GUNN, JR.

REFERENCES CITED The io'llowingreferences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 145,102 Hamilton Dec. 2, 1873 263,389 Coffin Aug. 29, 1882 445,944 Birkmire a- Feb. 3, 1891 1,007,619 Vogelmann Oct. 31, 1911 FOREIGN PATENTS Number Country Date 397,054 Germany June 17, 1924 

